148 research outputs found
Cooperative effects in surfactant adsorption layers at water/alkane interfaces
In the present work, the properties of dodecyl dimethyl phosphine oxide (C12DMPO) at the water/decane interface are studied and compared with those obtained earlier at the interface to hexane. To simulate the interfacial behavior, a two-component thermodynamic model is proposed, which combines the equation of state and Frumkin isotherm for decane with the reorientation model involving the intrinsic compressibility for the surfactant. In this approach, the surface activity of decane is governed by its interaction with C12DMPO. The theory predicts the influence of decane on the decrease of the surface tension at a very low surfactant concentration for realistic values of the ratio of the adsorbed amounts of decane and surfactant. The surfactantrsquo;s distribution coefficient between the aqueous and decane phases is determined. Two types of adsorption systems were used: a decane drop immersed into the C12DMPO aqueous solution, and a water drop immersed into the C12DMPO solution in decane. To determine the distribution coefficient, a method based on the analysis of the transfer of C12DMPO between water and decane is also employed
Drop profile analysis tensiometry with drop bulk exchange to study the sequential and simultaneous adsorption of a mixed β-casein /C12DMPO system
Methods of measuring rheological properties of interfacial layers (Experimental methods of 2D rheology)
Interfacial tensiometry as a novel methodology for the determination of surfactant adsorption at a liquid surface
The measurement of dynamic surface tensions of highly viscous- liquids by the maximum bubble pressure method
The analysis of dynamic surface-tension of sodium alkyl sulfate-solutions, based on asymptotic equations of adsorption kinetic-theory
Accurate analysis of the bubble formation process in maximum bubble pressure tensiometry
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